You're right. Project team members must have real LinkedIn profiles and all information must be clear. Never trust project without team information. Also, they must have some related experiences with project products, in crypto and finance field.
Nowadays its very easy to fake their identity thats why its a must to do an extensive research not only for the team but for their whole project. If you see an indication that it can be a scam then have doubt and think carefully. There are many scam projects existing specially the new one thus I prefer to invest in a popular coins because they already prove their uses and worth.